package ooday01;

public class ConsDemo {
    public static void main(String[] args) {
        Student s1 = new Student();
        Student s2 = new Student("哈利",17);
        Student s3 = new Student("赫敏",16,"jsd2302","003");
        s1.sayHi();
        s2.sayHi();
        s3.sayHi();
    }
}
